DISPLACEMENT DRILL Russian patent published in 2016 - IPC E02F5/16 

FIELD: mining.

SUBSTANCE: invention relates to devices for expanding vertical and inclined wells. Displacement drill includes a shank rigidly secured top truncated cone with vertex directed to the shank, cylinder with diameter D and bottom truncated cones with their axes are shifted parallel to longitudinal axis of the displacement drill rotation, and a tip. Upper cone, cylinder and bottom truncated cones are hollow. Upper cone is made in the form of polyhedral truncated pyramid. Cylinder is made in form of a pipe. Lower truncated cones are welded structure of hexagonal pyramid with welded to the surface of the plates in the form of conical layers surrounding the sector with angle from 60 to 180 degrees at the height of the sector from 0.6 to 0.8 D made of plates with thickness from 0.02 to 0.05 D.Layers on conical surface are arranged checkerboard, diametrically opposite with a pitch by sector height 0.6 to 0.8 D. Device contains a filler neck closing with a cover through which cooling water is supplied into the displacement drill.

EFFECT: reduced consumption of water for the displacement drill cooling during its operation.

1 cl, 3 dwg